The PJM Interconnection has issued a Hot Weather Alert for its Western Region for June 29 and a Hot Weather Alert for the entire region PJM serves for June 30 to July 3 ahead of an expected prolonged period of 90+ degree weather.
A Hot Weather Alert is an established procedure PJM issues ahead of forecasted hot weather and/or high humidity to prepare transmission and generation personnel and facilities for expected increases in electricity demand, or load. High temperatures are expected to remain in the 90s throughout the week of June 29.
This procedure does not require any action from customers.
Forecasted Peaks
As of 5 a.m. on June 26, 2026, PJM is expecting to serve the following approximate peak loads on June 29 through July 2:
| Date | Forecasted Peak Load |
| June 29 | 141,807 MW |
| June 30 | 150,188 MW |
| July 1 | 157,827 MW |
| July 2 | 160,892 MW |
These numbers are official as of 5 a.m. on June 26, 2026. They are subject to change and will be updated periodically. PJM publishes load forecasts out to seven days on Data Miner.
PJM’s record summer hourly integrated peak is 165,563 MW, set in 2006.
PJM also issued a Maintenance Outage Recall on June 25 ahead of next week’s forecasted hot weather. The recall requests for all maintenance outages to be returned to service by June 29 to increase the amount of generation available to meet customer demand.
Impacted Regions
The June 29 Hot Weather Alert for PJM’s Western Region includes the following transmission zones and control areas:
- AES Ohio (formerly Dayton Power & Light);
- American Electric Power (AEP Ohio, Appalachian Power, Indiana Michigan Power and Kentucky Power);
- American Municipal Power Transmission;
- ComEd;
- Cleveland Public Power;
- Duke Energy Ohio and Duke Energy Kentucky;
- Duquesne Light Company;
- East Kentucky Power Cooperative;
- FirstEnergy South – also known as Allegheny Power Systems (West Penn Power, Mon Power, Potomac Edison);
- FirstEnergy West – also known as American Transmission Systems, Inc. (Penn Power, Ohio Edison, The Illuminating Company and Toledo Edison); and
- Ohio Valley Electric Corporation.
"A dedicated team of operators uses sophisticated technology to balance supply and demand and direct the power grid 24/7 from PJM’s control rooms," PJM said.
They prepare multiple potential scenarios that could be impacted by weather, emergency conditions or equipment failure. They adjust resource output with changes in demand and ensure that no transmission lines or facilities are overloaded. The team also watches for unusual conditions and reacts to them to protect the electricity supply.
